6507/12-2
Export: PDF
-
General information
-
Wellbore history
GeneralThe purpose of drilling the second exploration well offshore Mid-Norway was to test the whole stratigraphic sequence between the seabed and 5000 m or basement whichever came first, as specified in the licence agreement,Vertical closures near base Jurassic, top Lower Triassic, and a possible Permian marker represented the primary targets. Any horizon below the mapped Near Base Jurassic reflector would, according to Saga's interpretation, also be closed and thus represent a possible trap.Operations and resultsWell 6507/12-2 was spudded with the semi-submersible installation Byford Dolphin on 9 June 1981 and drilled to TD at 5008 m in the Triassic Red Beds. When pulling out of hole after drilling the 17 1/2" to 1005 m a shallow gas kick was taken. The drill string got stuck m in the 8 1/2 " section at 3620 and could not be freed. The well had to be plugged back and sidetracked from 3347 m. The well was drilled with sea water and gel down to 354 m, with gel/gypsum mud from 354 m to 1005 m, with PAC/polymer/gypsum mud from 1005 m to 2522 m, and with salt saturated lignite mud from 2522 m to TD.The well turned out to be dry except for traces of hydrocarbons in a few minor sand-streaks in the Upper Triassic Red Bed sequence. Correlation to the well 6507/12-1 demonstrated generally that all the layers were thinning towards the hinge of the platform. In the Triassic, two significant salt units were encountered, with a total thickness of 800 m, separated by more than 500 m claystones/shales. Two cores were cut. The first was cut from 1929.3 m to 1947.3 m, but nothing was recovered on the rig. The second was cut from 4975 m to 4985 m with 92% recovered. The FIT-samples were attempted through the liner and the 9 5/8" casing at two levels (3010 m and 3002 m), but build up pressure was not achieved. The fluid sample recoveries were respectively 560cc and 550cc, both composed predominantly of mud filtrate.The well was permanently abandoned on 26 November 1981 as a dry well with shows.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]360.004449.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom24975.04984.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]9.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30353.536355.00.00LOTSURF.COND.20992.0261005.01.48LOTINTERM.13 3/82504.017 1/22522.01.70LOTINTERM.9 5/83616.012 1/43633.02.05LOTLINER74551.08 1/24554.02.04LOTOPEN HOLE5008.05 7/85008.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT33473972CBL VDL2872500CBL VDL GR13503570CST15132493CST25053526CST35504528CST47885005DLL MSFL GR33474528DLT MSFL GR45555003FDC CNL GR9882506FDC CNL GR34474558FIT30020FIT30100HDT9885008ISF BHC GR9882506ISF BHC GR33475007ISF BHC MSFL GR25003616ISF LSS GR3451002LDT CNL GR25003617LDT CNL GR45555003RFT19482489RFT25713290VSP/WST5603561VSP/WST33235005WST2882502 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2862861020130513051717171717831818181818721872187819221922200720072076219326052727 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf1.00 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf4.86pdf1.26pdf5.66pdf1.24pdf0.57pdf0.59 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf14.56 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured7301.1342.0water based13801.1454.0water based19201.1548.0water based26151.1553.0water based29101.1648.0water based36001.3156.0water based37201.69102.0water based39001.6668.0water based45101.6560.0water based49901.6370.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1570.0[m]DCOD2016.0[m]SWCSNEA2023.0[m]SWCSNEA2053.0[m]SWCSNEA2071.0[m]SWCSNEA2104.0[m]SWCSNEA2183.0[m]SWCSNEA2310.0[m]SWCSNEA2351.0[m]SWCSNEA2400.0[m]DCOD2420.0[m]DCOD2440.0[m]DCOD2442.0[m]SWCSNEA2460.0[m]DCOD2480.0[m]DCOD2482.0[m]SWCSNEA2500.0[m]DCOD2520.0[m]DCOD2541.0[m]DCOD2559.0[m]DCOD2589.0[m]DCOD2610.0[m]DCOD2631.0[m]DCOD2652.0[m]DCOD2670.0[m]DCOD2691.0[m]DCOD2709.0[m]DCDC2733.0[m]DCOD2751.0[m]DCOD2769.0[m]DCOD2790.0[m]DCOD2811.0[m]DCOD2829.0[m]DCOD2850.0[m]DCOD2868.0[m]DCOD2889.0[m]DCOD2910.0[m]DCOD2931.0[m]DCOD2949.0[m]DCOD2970.0[m]DCOD2990.0[m]SWCPAES2991.0[m]DCOD3009.0[m]DCOD3030.0[m]DCOD3051.0[m]DCOD3069.0[m]DCOD3090.0[m]DCOD3111.0[m]DCOD3127.2[m]SWCPAES3129.0[m]DCOD3147.0[m]DCOD3168.0[m]DCOD3189.0[m]DCOD3210.0[m]DCOD3234.0[m]DCOD3252.0[m]DCOD3270.0[m]SWCPAES3273.0[m]DCOD3291.0[m]DCOD3305.0[m]SWCPAES3307.0[m]DCOD3330.0[m]DCOD3351.0[m]DCOD3360.0[m]SWCPAES3369.0[m]DCOD3390.0[m]DCOD3411.0[m]DCOD3429.0[m]DCOD3435.0[m]SWCPAES3447.5[m]SWCPAES3450.0[m]DCOD3471.0[m]DCOD3476.0[m]SWCPAES3489.0[m]DCOD3501.0[m]DCOD4278.0[m]SWCSNEA4526.0[m]SWCSNEA4794.0[m]SWCPAES4823.0[m]SWCSNEA4825.0[m]SWCPAES4860.0[m]SWCPAES4890.0[m]SWCPAES4916.0[m]SWCPAES4935.0[m]SWCPAES4962.0[m]SWCPAES5005.0[m]SWCPAES